Underground Tunnels, UFO and Secret Government Facilities ...

Tunnels and underground excavations | engineering ...

Tunnels and underground excavations: Tunnels and underground excavations, horizontal underground passageway produced by excavation or occasionally by nature's action in dissolving a soluble rock, such as limestone.

Tunnel - Wikipedia

A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.

The Inner Earth & Realm of Aghartha

Rapture (BioShock) - Wikipedia

Rapture is an underwater city, located in the north Atlantic Ocean somewhere between Greenland and Iceland.It is only accessible by a system of bathyspheres.The city was designed to be self-sufficient, growing and raising its own crops as well as using the surrounding sea life for food, and taking advantage of submarine volcanoes to provide ...

Norway could build the world's first underwater floating ...

Jul 26, 2016 · Cars and pedestrians would be able to cross the underwater tunnel. NPRA. The west side of Norway is made up of 1,190 fjords, which, while beautiful, make it very hard to travel along the country's coastline.

Facts About Tunnels: Types and Uses - Easy Science For Kids

World's largest underwater cave newly discovered ... - Newsweek

Divers in Mexico have discovered the largest known underwater, flooded cave in the world. The discovery could reveal more about the pre-Hispanic, ancient community that existed in the region. The Yucatan Peninsula, where the cave is located, still holds treasures from the ancient Mayan community ...